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Polyurethane foam grouting material and method for concrete engineering in alpine regions

A technology of grouting materials in alpine regions, applied in the field of polyurethane foam grouting materials for concrete engineering in alpine regions, can solve the problems of slow curing of grout, more solvents, water leakage, etc., to improve the ability of molecular movement, improve Reactivity, viscosity-lowering effect

Active Publication Date: 2019-06-04
UNIT 61489 OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, ordinary polyurethane foam grouting materials are used at around 20°C. In alpine regions, the construction temperature is often as low as below 10°C, and they need to withstand frequent freeze-thaw cycles. Therefore, conventional foamed polyurethane grouting materials cannot Meet the use requirements
In addition, in the alpine environment, the curing process of the slurry is sensitive to the external temperature. When the ambient temperature drops, the slurry is prone to problems such as slowing down of curing, resulting in a decrease in the overall performance of the consolidated body; the non-volatile content is too low, and too much solvent is added to the slurry , leading to a large linear change rate of the size of the consolidated body after drying, poor volume stability, poor durability, premature failure of the material, and repeated occurrence of water leakage
Conventional polyurethane grouting materials are difficult to meet the above application requirements

Method used

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  • Polyurethane foam grouting material and method for concrete engineering in alpine regions
  • Polyurethane foam grouting material and method for concrete engineering in alpine regions
  • Polyurethane foam grouting material and method for concrete engineering in alpine regions

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preparation example Construction

[0023] 1) Preparation of alkoxy-terminated polysiloxane, take 100g of hydroxyl-terminated silicone oil (viscosity 500mPa·s) in a round bottom flask, heat and stir under nitrogen protection to 80°C-120°C, slowly drop it with a dropping funnel Add 10 g of methyltrimethoxysilane, after the dropwise addition, continue to heat and stir for 5 hours, and then use an oil pump to distill under reduced pressure until no more bubbles are generated to obtain component A; the residue in the bottle is alkoxy-terminated polystyrene Siloxane, its reaction equation is as follows:

[0024]

[0025] 2) Preparation of silicone-modified polyether polyols, polyether polyols, one or one selected from polyethylene glycol 400-1000, polypropylene glycol 400-1600, polyoxypropylene triol N-330 Add 100 g of the above mixture to 10 g of the alkoxy-terminated polysiloxane in step 1), stir and react at 120°C for 5 hours under nitrogen protection, and then use an oil pump to distill under reduced pressure ...

Embodiment 1

[0031] Take 100g of polyethylene glycol 400, add 10g of alkoxy-terminated polysiloxane, stir and react at 120°C for 5h under the protection of nitrogen, and then use an oil pump to distill under reduced pressure until no more bubbles are generated to obtain component A. Take 50g of poly-MDI and add 100g of silicone-modified isocyanate to obtain component B. The mass ratio of component A and component B is 0.8:1, which is the foaming grout.

Embodiment 2

[0033] Take 100g of polyethylene glycol 1000, add 10g of alkoxy-terminated polysiloxane, stir and react at 120°C for 5h under the protection of nitrogen, and then use an oil pump to distill under reduced pressure until no more bubbles are generated to obtain component A. Take 100g of poly-MDI and add 100g of silicone-modified isocyanate to obtain component B. The mass ratio of component A and component B is 1:1, which is the foaming grout.

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PUM

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Abstract

The invention belongs to the technical field of polymer fine chemical industry, and discloses a high cold region concrete engineering polyurethane foaming grouting material and a preparation method thereof, wherein the used grouting material is mainly prepared by carrying out a mixing reaction on a component A and a component B, the component A is an organosilicon-modified polyether polyol, the component B is an organosilicon-modified isocyanate and polyisocyanate, and a mass ratio of the component A to the component B is 0.8:1-1.2:1. According to the present invention, through the flexible modification with the organosilicon, the reaction activity of the isocyanate can be increased, and the obtained foamed polyurethane has good elasticity, provides strong adhesion to concrete, has moderate foaming rate, does not easily produce breaking, shedding and other phenomena under the influence of the external environment, forms the polymer interpenetrating network structure through the organosilicon network and the polyurethane network, and can maintain the good strength of the polymer network so as to provide effects of rapid water blocking and durability in the harsh environment in the high cold region.

Description

technical field [0001] The invention belongs to the technical field of polymer fine chemicals, and relates to a polyurethane foam grouting material and method for concrete engineering in alpine regions. Background technique [0002] Concrete is a heterogeneous porous and brittle material with a large number of pores inside, low tensile strength and lack of toughness. Once the external tension exceeds its tensile capacity, cracks will occur, and once cracks appear in concrete, it will not only provide convenience for external erosive media to enter the interior of the concrete, accelerate the damage process, affect its durability, but also affect its appearance, and then Lead to leakage, freeze-thaw damage, strength decline and many other problems. Among them, grouting is the most direct and effective method. On the basis of the original concrete structure, the grouting technology can try not to damage the original structure, and can repair the damaged concrete structure, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/50C08G18/61C08G101/00
CPCC08G18/5096C08G18/61C08G18/7664C08G18/7671C08G2101/00C08G2270/00
Inventor 潘水艳罗文李英军曹少华黄驰胡铭杰白彦光王幸高杰
Owner UNIT 61489 OF PLA